Spring Security + Cas Auth + Static User List allowed

Question

I have my app with a spring security configuration, that connect to a cas server (working):

@EnableWebSecurity
@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Value("${cas.service-url}")
    private String serviceUrl;

    @Value("${cas.cas-url}")
    private String casUrl;

    @Autowired
    private AuthenticationProvider authenticationProvider;

    @Autowired
    private AuthenticationEntryPoint authenticationEntryPoint;

    @Autowired
    private SingleSignOutFilter singleSignOutFilter;

    @Autowired
    private LogoutFilter logoutFilter;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf()
                .disable()
                .authorizeRequests()
                .regexMatchers("/secured.*")
                .authenticated()
                .and()
                .authorizeRequests()
                .regexMatchers("/")
                .permitAll()
                .and()
                .httpBasic()
                .authenticationEntryPoint(authenticationEntryPoint)
                .and()
                .addFilterBefore(singleSignOutFilter, CasAuthenticationFilter.class)
                .addFilterBefore(logoutFilter, LogoutFilter.class);
    }

    @Override
    protected AuthenticationManager authenticationManager() throws Exception {
        return new ProviderManager(Arrays.asList(authenticationProvider));
    }

    @Bean
    public CasAuthenticationFilter casAuthenticationFilter(ServiceProperties sP) throws Exception {
        CasAuthenticationFilter filter = new CasAuthenticationFilter();
        filter.setServiceProperties(sP);
        filter.setAuthenticationManager(authenticationManager());
        return filter;
    }

    @Bean
    public ServiceProperties serviceProperties() {
        ServiceProperties serviceProperties = new ServiceProperties();
        serviceProperties.setService(serviceUrl);
        serviceProperties.setSendRenew(false);
        return serviceProperties;
    }

    @Bean
    @Primary
    public AuthenticationEntryPoint authenticationEntryPoint(ServiceProperties sP) {
        CasAuthenticationEntryPoint entryPoint = new CasAuthenticationEntryPoint();
        entryPoint.setLoginUrl(casUrl + "/login");
        entryPoint.setServiceProperties(sP);
        return entryPoint;
    }

    @Bean
    public TicketValidator ticketValidator() {
        return new Cas30ServiceTicketValidator(casUrl);
    }

    @Bean
    public CasAuthenticationProvider casAuthenticationProvider() {
        CasAuthenticationProvider provider = new CasAuthenticationProvider();
        provider.setServiceProperties(serviceProperties());
        provider.setTicketValidator(ticketValidator());
        provider.setUserDetailsService((s) -> {
            return new User(s, "fakepassword", true, true, true, true, AuthorityUtils.createAuthorityList("ROLE_ADMIN"));
        });
        provider.setKey("CAS_PROVIDER_IMPORT_PARCOURSUP_KEY");
        return provider;
    }

    @Bean
    public SecurityContextLogoutHandler securityContextLogoutHandler() {
        return new SecurityContextLogoutHandler();
    }

    @Bean
    public LogoutFilter logoutFilter() {
        LogoutFilter logoutFilter = new LogoutFilter(casUrl + "/logout", securityContextLogoutHandler());
        logoutFilter.setFilterProcessesUrl("/logout/cas");
        return logoutFilter;
    }

    @Bean
    public SingleSignOutFilter singleSignOutFilter() {
        SingleSignOutFilter singleSignOutFilter = new SingleSignOutFilter();
        singleSignOutFilter.setCasServerUrlPrefix(casUrl);
        singleSignOutFilter.setIgnoreInitConfiguration(true);
        return singleSignOutFilter;
    }

    @EventListener
    public SingleSignOutHttpSessionListener singleSignOutHttpSessionListener(HttpSessionEvent event) {
        return new SingleSignOutHttpSessionListener();
    }

}

Now I would like to add a list of autorized login who are the only ones the can access the app (ie: to access they have to be in cas AND in the static list).

String allowedLogin = List.of ("robert.bob", "john.jon");

I find this link: Spring security - specific users but I don't know how to implement 'StaticUserProvider' and where to configure it in my config.

Answer 1

I think the easiest way would be to just throw a UsernameNotFoundException in your UserDetailsService if the user is not in the list. Like that:

    provider.setUserDetailsService((s) -> {
        if(!allowedLogin.contains(s.getAssertion().getPrincipal().getName())) {
            throw new UsernameNotFoundException("user not authorized to use app");
        }
        return new User(s, "fakepassword", true, true, true, true, AuthorityUtils.createAuthorityList("ROLE_ADMIN"));
    });